I am looking for some sources that would help me in my quest to build an electric bike hybrid. I know there a lots of kits out there that seem for the most part "bolt-up" but those are a bit expensive and i feel like i would enjoy more of a challenge from building from scratch. I have fair knowledge of electronics and i am mechanically inclined. I am assuming i would need the basics, motor, controller, battery. I do not quite understand the concept of having multiple shifters that i have seen with most of these kits and why the are needed for the motor to function, i thought it was a push button type thing haha. I am also just having a hard time finding these items separately sold. I have done a bit of research on multiple forums. It seems there is a vast variety of different options. I just really want something that i can take to the local park, maybe cruise on the sidewalk for a bit then hit into the trails with a bit of help. I am 6'4" 250 pounds so i am looking for,from what i have read, a 1000W motor or more? I do not currently have a bike to customize, i was looking to buy either a used one or a fairly cheap new one. Any information or links that you guys could help me out with will be much appreciated. Thank you!